[V4MD] unique between two fields

[info at vallemediatime.com]

Hi Ruslan,
I need to make two fields unique in this manner:

eg
F1 Disipline   F2 Year

F1           F2
Music   |  2005   --ok
Music   |  2006   --ok
Music   |  2005   wrong

How can I do?

Thanks 
Paolo
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